I tried burning a Twitter Feed with Feedburner so I could take advantage of the BuzzBoost feature to promote my twitter feeds on other websites.  It doesn’t work.  Feedburner says there was a “400 error” and that the rss may not have been valid.

When you check the rss, it is fine.  The problem is Feedburner doesn’t like Twitter.  It almost seems like feedburner have decided to block Twitter.

I created a small php file  I called “t.php” on my site to test my theory.

<?php
$twitter_feed = file_get_contents('http://twitter.com/statuses/user_timeline/USERNAME.rss');
echo $twitter_feed;
exit;

Then I used http://example.com/t.php as the feed url instead of the twitter url.  It worked perfectly.  Feedburner had no problems, even though the feed is identical, which lends weight to my theory that Feedburner is blocking Twitter.

I hope you find this work around useful.